Though my 920XT shows that it was connected to the Mac (watch face shows the USB logo and charging logo), however, Garmin Express is unable to detect it. Does any others face the same issue? Does Garmin able to solve this issue?
Why is my Garmin mass storage device not communicating with Garmin Mac applications? http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={b824ca10-f8d8-11e3-c98c-000000000000}&kbName=garmin
If the device is still not detected, contact Product Support by phone for further assistance.